refactor: Remove legacy backwards compat code

Remove the configure shell code blocks

installers/install_uv.sh

@@ -85,12 +85,6 @@ configure_shell() {
     # Add ~/.local/bin to PATH for the current process
     export PATH="$HOME/.local/bin:$PATH"
 
-    # Clean up legacy in-place configuration blocks
-    IFS=' ' read -ra target_files <<< "$(get_shell_configs)"
-    for config_file in "${target_files[@]}"; do
-        remove_block "$config_file" "local-bin path"
-        remove_block "$config_file" "uv completion"
-    done
 
     write_env_snippet "local-bin" 'export PATH="$HOME/.local/bin:$PATH"'
     write_env_snippet "uv" 'eval "$(uv generate-shell-completion bash)"'